A re-release flight for fuel purposes is not at all the same thing as launching to a destination that's below weather minimums using another field as destination.
We can't initiate a flight if the destination isn't forecast to be legal. We can launch to a different destination and then change, but it's not at all a common thing.
We do dispatch with a re-release authorization; we don't have the legal fuel to go all the way to the destination. We do have an authorization to file to an intermediate point for which we have the fuel, and if we are able to determine within two hours of reaching a pre-calculated "re-release point" we can do the second leg of the trip with the reguired fuel reserves, we press on. If we don't, we land at the re-release destination.
Bear in mind that this isn't an arbitrary act; it's a special authorization applied to our operating certificate which spells out exactly what the terms and conditions of this authorization represent, and we abide by them exactly.
We don't launch for a destination where we know we can't go.